A New Intrageneric Dendroica Hybrid from Hispaniola
| Autor: | Kenneth C. Parkes, Steven C. Latta, Joseph M. Wunderle |
|---|---|
| Rok vydání: | 1998 |
| Předmět: | |
| Zdroj: | The Auk. 115:533-537 |
| ISSN: | 1938-4254 0004-8038 |
| DOI: | 10.2307/4089220 |
| Popis: | On 7 November 1993, while Latta (SCL) and Wunderle (JMW) were mist-netting in a shade coffee plantation 2 km northwest of Jumunucu, La Vega Province, Dominican Republic (elevation 600 m), an unusual-appearing warbler was captured when it responded to the playback of American Redstart (Setophaga ruticilla) chip-notes. Because they were unable to identify the individual (which appeared to be a Dendroica), SCL and JMW made extensive notes on plumage characteristics and measurements, and photographed and color-banded the bird. It was seen repeatedly in the following eight days in the same coffee plantation, after which time SCL and JMW left the area. Comparisons of their descriptions with specimens at the University of Michigan Museum of Zoology (UMMZ) failed to provide an identification of the bird. It was still present at the same location when SCL and JMW returned on 22 January 1994, at which time it was collected. Materials and methods.-The bird was prepared as an alcohol specimen (field no. DR002, UMMZ 233,474) and sent to Parkes (KCP) for a detailed analysis. It was identified as a male by the presence of a left testis. The plumage was dried with a hand-held hair drier. It was identified as a second-year (SY) bird by the worn condition of its primary wing coverts (Pyle et al. 1987:135). All measurements were made with birds of the same sex/ age class, including the flattened wing, tail, and chord of hind claw. The need for segregating specimens by age class was demonstrated by comparisons of Magnolia Warblers (Dendroica magnolia); for the flattened wing measurement, 11 hatching-year (HY) and SY males had a range of 59 to 62 mm (x = 60.3 ? SD of 0.093 mm), whereas 12 after-second-year (ASY) males had a range of 59.5 to 65 mm (x = 62.25 + 0.062 mm). The general color pattern, body size, and the shapes of the bill, wing, and tail identified the bird as a Dendroica warbler. Accepting that it was a hybrid and not merely an aberrantly plumaged individual, a search was made among male Dendroica for the most likely parents. Factors to be considered included the breeding ranges of the potential parent species and whether one or both winters in the West Indies. These factors, plus the face pattern (including a |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|